I'm using Headway Themes (version 2.something) and HostGator. (FYI)
When I click to connect the plugin with Twitter and Facebook, rather than giving me what I assume should be an "authorize" popup, I get a popup of my own site in its visual editor. (My site is not yet live - I have it redirecting to a MailChimp sign up form.) I tried in both Firefox and Chrome. I built a website last fall with the same theme and host and had no trouble using Social.